Jointed ash pan for combustible gas generators



May 14, 1935. J: HAUG 2,001,274

JOINTED ASH PAN FOR COMBUSTIBLE GAS GENERATORS v 7 Filed June 29, 1932 2 Sheets-Sheet 1 F/6.2. FIG 4 //VVEA/7.0/F

WIT/V558. (7 0272 By a v I 3 S y 1935. .Ls. 'HAUG 2,001,274

JOINTED ASH PAN FOR COMBUSTIBLE GAS GENERATORS Filed June 29, 1932 2 Sheets-Sheet 2 Patented May 14, 1935 I I UNITED STATES PATENT OFFICE JOINTED As'n PAN Foa COMBUSTIBLE oas GENERATORS John s. Hang, Philadelphia, Pa., assignor to United Engineers and Constructors, Ina, Philadelphia, Pa, a corporation of Delaware Application June 29,1932, Serial No. 619,833 s (01. 110-165) The present invention relates generally to 5fguge 5 shows a \(riertical cross section on line mechanically operated, ash extraction apparatus Figure 4, an for combustible gas generators, Figure 6 shows a detail of Figure 4 with deck Such generators are provided with mechanical platefs remotedi l 1 6 grates, usually rotating and provided with an Re erring 0 sure e ash pan which forms a support for the fuel bed i im trally gficatesfa wter gasdgeneratgg and from which the ashes are discharged. adap d 0 con the uel. d an provi Ighils ggililiiegglly disirabletto intarioducedthio gas with tlsefair supiplylmteiafins ildantcl3 steam supply 8 8 as or ins ance r an s eam, means p a as g an 5 11 8 r sp c- 10 through a tuyere extending upward into the tively. 5 is the steam supply means for down 30 central portion of the lower part of the fuel bed, aming, 5 1s the oiftake for the blast gas and ghhichsth yere is usually silllilllilllndgd by tlze ash non. prun vgater gas aangl l is the oltftakrzlflor dew:

ea panmayrotatew'e hetuyreissa-" n'w n nn ar erwa rtionary or vice versa, or both may rotate in the igfi l o the feed Water inlet 9 and t-M same direction or in opposite directions. e 1

Due to the usual methods of introducing t The generator is provided with a. mechanical gas making fluids and of operating th generator, grate comprising the tuyere or blast distributor temperature conditions are not uniform throughextendmg pward mto the fuel bed and, as out any given horizontal cross section of the fuel Shown w t dlagrammatically, providing 213 bed. As a result different portions of the ash 1 for the entrance of he s ma n fluids pan are exposed to different temperature condi- (all' and steam) to the fuel bed n for a n 332s and tthe ash pan is not heated uniformly gfl g wn run wtatgr gag hilllih the fulell bglhThe ug ou V uy re 18 moun on pan w 1c ex- Under certain operating conditions t inner tends outwardly from the base of the tuyere and portion of th n pan is h t more highly which is provided with the outwardly extending 25 than the outer or circumferential portion. As a euthng ribs The ash D 18 supported on a result the outer portion acts somewhat as a hoop igl lngh arins ilildlcoiiesddaiii I4 115 provider; resisting the expansion of the inner portion, caus- W1 e Worm W ee ven Y e Wo m ing complicated strains to be set up in the outer 50 that the ash D n, u ting ribs. and tuyere slowportion which results frequently in cracks dee l a h d sg the l r iig k 2 veloping. Under other operating conditions the mg 5 F ear 0 an situation may be reversed with the outer portion the P of plows l7, eject the clinlfel n more highly heated than the inner portion. ash into the ash Peekets of which 15 The principal object of the present inven- Cated at tion is the provision of an expansion joint or e P provlded wlth an n r x- 35 joints between portions of the ash pan so that pansmh Joint indicated at and shewn in m the various portions may expand in response to detail m mguresz and gie unreqiigl. heating without setting up destrucg ii g g gz gfi iizgi inner ion of ve s a P w The invention will be described in more detail the ash panflwhile ShW$ the inner P 40 in connection with the attached figures which an 011W P0111011 of the Pan, a vertical sectwn form a part of the specification and which show f ih for at As shown its application to a particalar type of mechanical g fig; 6f 3 fig i g z ggg g gfi f g s g g g z zi z Theouter portion 2| of the pan is provided Figure 1 shows a vemal cross section of a with the extension 22 which underlies the rim of 1 the inner portion 20 of the pan and to which the water gas generator with a rotating mechanical inner portion is bolted as by the tap bolt 23 The grate including a rotating ash pan. 1

bolt holes, one of which is shown at, are made so Figure 2 shows a wheel cmss sechm over size to permit the two portions of thepan ti n of h ash P showmg an expansion 1 to slide relative to each other. The bolt holes in Figure 3 shows a vertical cross section of the t two portions are arranged that when the joint of Figure2 between bolts. portions are bolted together unheated there is Figure 4 shows a plan view of a portion of the left the space 25 between them. The lip 2601 5 ash pan of a modification. the inner portion of the pan overlies this space to prevent the entrance of ash into the space. A small recess 21 is provided to form a pocket for any small quantity of ash which may work its way under the lip 26. The bolts are protected by being placed in recesses as 28.

As shown in Figure 2 the joint has been arranged so that the inner portion of the pan 2!! may expand outwardly relative to the portion 2|, sliding' on the extension A2. The oversize bolt holes 24 and the space 25 provide the room for the relative movement.

Referring to Figure 3.

This shows a section of the ash pan between bolts. 29 shows one of a number of radial keys which fit into radial key ways in the inner and outer portions 20 and 2|. The keys connect the inner and outer portions so that the inner portion of the pan rotates with the outer. The keys are free to expand radially inward at 30 and do not hinder the relative radial movement of the two portions of the pan.

Referring to Figures 4, 5 and 6.

These figures show an ash pan of the same general type as the ash pan of the previous figures but of modified construction.

The pan is formed by sectional deck plates secured to an underlying frame. The outer frame, indicated at 40, has bolted to it the outer deck plates 4|, by an outer series of bolts indicated at 42,, which pass through radially slotted bolt holes in the frame as indicated at 43 in Figure 6 g and by an inner series of bolts indicated at 44 which pass through bolt holes 45 in the frame.

The inner portion of the ash pan is made up of sections 46, bolted or otherwise jointed together as at 41 and also fastened to the frame 40 by the bolts 48 which pass through radially slotted holes 49 in the frame.

The frame is provided with the stiffening ribs 50 and carries.the driving means as for instance the worm wheel 5|. The surface 52 of the frame may slide on an annular bearing similar to l4 in Figure h A tuyere similar to II in Figure 1 may be mounted on the pan at 53.

It will be apparent that the inner the pan may expand relative to the outer portion due to the provision of a space 54 between the ends of the inner and outer plates, and because of the provision of the slotted bolt holes 49 which provisions permit the inner portion of the pan to slide radially on the frame. The slotted bolt holes 43 permit the outer deck plates. to expand radially, sliding on the frame while the inner ends of these plates are held by the bolts 44.

As shown in the figures the outer deck plates portion of are separated by radial spaces 55 which permit some expansion at right angles to the radius, the

- bolt holes being slightly larger than the bolts.

The inner and outer portions of the pan rotate together, the drive being transmitted through the bolts 48.

56 is a cutting rib similar to the ribs IS in I Figure 1.

. The invention has been described in connection with a water gas generator and in connection with a certain type of grate. In its broader aspect it is applicable to grates of other types for producers, water gas generators and other types of shaft furnaces in which a column of fuel is supported by an ash pan which is subjected to unequal tem-- perature conditions in its various portions. In the illustrations described .the ash pan is shown providedwith annular joints. i Under certain conditions, especially with fuel beds of large diameter it may be desirable to provide a plurality of such joints at various distances from the center. The exact position of the joint or joints with respect to the center of periphery of the pan will depend upon the type of furnace, method of air distribution and other operating conditions.

The provision'of radial joints 55 between the deck plates, as illustrated in the outer portion of the pan shown in Figs. 4, 5 and 6, permits expansion to take place in the pan with no appreciable increase in the inner periphery of the portion pro- 10 vided with such joints. This makes it unnecessary to provide slotted bolt holes at the inner periphery of such deck plates and reduces the increase in diameter of the outer periphery on and of the attached claims may require.

I claim:

1. A grate for a combustible gas generator including an ash p'an having an annular outer por- 25 tion, an annular inner portion adjacent thereto, and means connecting said portions and providing for relative radial movement therebetween.

2. A grate for a'combustible gas generator including an ash pan having an annular outer :0 portion, an annular inner portion resting at its outer edge on said-outer portion, and means connecting said portions and providing for relative movement therebetween.

3. A mechanical grate for a combustible gas 35 generator including in combination an ash pan having an annular outer portion, an annular in-' nerportion adjacent thereto, and bolts connecting said portions together, one of said portions having enlarged bolt holes therein to provide for 40 radial sliding movement of said portions.

4. A mechanical grate for a combustible gas generator including an ash pan having an annular outer portion, an extension on the inner edge of said outer portion, an annular inner portion 45 whose lower edge rests on said extension, means for connecting said portions so as to provide for radial sliding movement therebetween, and keys preventing relative rotary movement between said portions.

5. A mechanical grate for a combustible gas generator including an ash pan having an annular outer portion, an annularinner portion adjacent thereto, said portions having faces in sliding contact with each other, means connecting 55 said portions together for sliding radial movement, means for preventing rotary movement between said portions,said portions being spaced to provide a chamber between their non-horizontal surfaces, and a lip on said inner portion on overlying said chamber and the adjacent part of said outer portion.

6. A mechanical grate for a combustible gas generator including an ash pan having an underlying frame, outer deck plates secured to said a frame, means for connecting said outer deck plates to said frame and providing for radial sliding movement between portions of said deck plates and saidframe, inner deck plates secured to said frame, and means for attaching said in- 7 ner deck plates to said frame and providing for relative radial movement between portions of said deck plates and said frame.

7.-A mechanical grate for a combustible gas generator including an ash pan, said ash pan com- 1 prising in combination, an underlying frame, outer deck plates secured to said frame, said outer deck plates being spaced apart to provide openings between them extending radially of said ash pan, means for connecting said outer deck plates to said frame and providing for radial and circumferential movement between said deck plates and said frame, inner deck plates secured to said frame, and means for attaching said inner deck plates to said frame and providing for relative radial. movement between said inner deck plates and said frame.

8. A mechanical grate for a combustible gas generator including an ash pan, said ash pan comprising in combination, an underlying frame,

outer deck plates secured to said frame, said outer deck plates being spaced apart and providing openings between themextending radially of said ash pan, inner deck plates secured to said frame, and means for attaching said deck plates to said frame and providing for relative radial movement between said deck said frame. I

JOHN S. BAUG.

plates and m 

